I am getting this error in 3ds Max 2018. When I changed renderer to Arnold and I open material editor, the below error pops-up.

Render Message: Arnold

SYSTEM: Material Editor renderer is changed to Scanline Renderer. Previous messages are cleared.SYSTEM: Material Editor renderer is changed to Arnold. Previous messages are cleared.This material is not supported: 01 – Default (Standard). An approximation will be used.This material is not supported: 02 – Default (Standard). An approximation will be used.This material is not supported: 03 – Default (Standard). An approximation will be used.This material is not supported: 04 – Default (Standard). An approximation will be used.This material is not supported: 05 – Default (Standard). An approximation will be used.This material is not supported: 06 – Default (Standard). An approximation will be used.This material is not supported: 07 – Default (Standard). An approximation will be used.This material is not supported: 08 – Default (Standard). An approximation will be used.This material is not supported: 09 – Default (Standard). An approximation will be used.This material is not supported: 10 – Default (Standard). An approximation will be used.This material is not supported: 11 – Default (Standard). An approximation will be used.This material is not supported: 12 – Default (Standard). An approximation will be used.This material is not supported: 13 – Default (Standard). An approximation will be used.This material is not supported: 14 – Default (Standard). An approximation will be used.This material is not supported: 15 – Default (Standard). An approximation will be used.This material is not supported: 16 – Default (Standard). An approximation will be used.This material is not supported: 17 – Default (Standard). An approximation will be used.This material is not supported: 18 – Default (Standard). An approximation will be used.This material is not supported: 19 – Default (Standard). An approximation will be used.This material is not supported: 20 – Default (Standard). An approximation will be used.This material is not supported: 21 – Default (Standard). An approximation will be used.This material is not supported: 22 – Default (Standard). An approximation will be used.This material is not supported: 23 – Default (Standard). An approximation will be used.This material is not supported: 24 – Default (Standard). An approximation will be used.

How to solve this?

1
Answer

It’s easy to solve this error. Actually Arnold renderer does not support the Mental-Ray materials.
So You’ll have to replace all your standard materials with Arnold materials in order to get rid of those errors.